[Haskell-beginners] Re: The Data Parallel Haskell example from the Haskell Wiki won't work

João Paulo Pizani Flor joaopizani at gmail.com
Tue Sep 28 07:41:25 EDT 2010

Well, it seems that my problem is solved. I copied again the whole example,
this time literally (Ctrl-C, Ctrl-V), and it just worked.

Problem is, I still don't know what went wrong with my previous attempt :P

Anyways, thanks!

João Paulo Pizani Flor
joaopizani at gmail.com
Ciência da Computação - 2007/1
Universidade Federal de Santa Catarina

2010/9/27 João Paulo Pizani Flor <joaopizani at gmail.com>

> Hello dear Haskell People! I'm currently very interested in doing some
> parallel programming in Haskell, specially in using the Data Parallel
> Haskell stuff...
> So as a first step I tried to emulate the vector multiply example found in
> the Haskell Wiki:
> http://www.haskell.org/haskellwiki/GHC/Data_Parallel_Haskell#A_simple_example
> The code I've written (two files) for this example is in the following
> pastebins:
> DPHVecMul.hs:  http://paste.org/pastebin/view/22899
> Main.hs:  http://paste.org/pastebin/view/22900
> I've compiled successfully both files and linked them, exactly as described
> in the Wiki. But when I run the resulting executable, the following error
> shows up:
> "dotp: Prelude.undefined"
> It's seems (from the tests I've done) that the call to the function *fromPArrayP
> *of the module *Data.Parallel.Array.Prelude *results always in undefined.
> In fact, I've taken a look at the function definition in the docs, and in
> fact it always returns undefined. It doesn't make ANY SENSE to me :P
> Has someone been able to successfully compile and run this example code??
> If so, what am I doing wrong? Is there some obvious error I'm incurring in?
> :D
> Regards,
> João Paulo Pizani Flor
> joaopizani at gmail.com
> Computer Science - 2007/1
> Federal University of Santa Catarina - Brazil
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